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United States’ Phil Mickelson, left, and teammate Zach Johnson chat on the second hole during their four ball match at the Presidents Cup golf tournament at the Jack Nicklaus Golf Club Korea, in Incheon, South Korea, Friday, Oct. 9, 2015.(AP ... more >

INCHEON, South Korea (AP) - The International team wound up winning two holes in one at the Presidents Cup on Friday when Phil Mickelson didn’t know the rules.

Mickelson was not aware of the one-ball condition for his fourballs match, switching to a different model to give him a better chance of reaching the par-5 seventh green. The rules committee made a mistake of its own to compound the error in a bizarre sequence of events.

The result? Jason Day and Adam Scott went from all square to 2 up in just one hole.

Mickelson’s mistake wound up costing the Americans a half-point when the match ended in a draw.

“It’s a strange situation,” said Mark Russell, the vice president of rules and competition for the PGA Tour.

The one-ball condition means that players cannot switch golf ball models during the round. The penalty is known as a one-hole adjustment. So when Mickelson realized he was playing with a different ball, the International team was to be awarded one hole.

That was bad enough.

Then, match referee Gary Young consulted with the rules committee, and Russell said he told him that Mickelson was disqualified from the hole. Russell said he checked with other officials on the committee and they concurred. Only later did they realize Mickelson should have been allowed to complete the hole.

Day won it with a birdie to go 1 up over Mickelson and Zach Johnson, and it became 2 up because of the one-hole adjustment.

Mickelson didn’t think anything of the rule when he put a different ball in play, mainly because there is not a one-ball rule at the PGA Championship or the Ryder Cup when it is held in America. Only when he was walking down the seventh fairway and saw U.S. captain Jay Haas did he think to ask.

“I’m sure it’s not an issue,” Mickelson said he was thinking. “And it turns out that there was a one-ball rule and it was an issue. Obviously as a player, you need to know that. You need to know the rules, and if you have a question, you do it beforehand.

“The weird thing was I’ve never heard of a match adjustment penalty,” he said. “I just thought, ‘OK, if I hit the wrong ball, no big deal. Zach will cover me on this hole’ But obviously, that’s not what happened.”

Russell said once a shot had been played, the committee could not go back and have Mickelson finish the hole because “allowing a correction could potentially undermine the strategy” already in play by both teams.

“It’s just unfortunate that he was told he had to pick up the ball,” Haas said. “Had he been able to play out and make a 4 and tie the hole, then it would only have been 1 down instead of 2 down. But that didn’t happen, so nothing you can do about it.”

The mistake by Mickelson was not knowing the rules. The mistake by the rules committee was not letting him finish the hole.

“Phil made a mistake. It’s unfortunate that they didn’t immediately say that he could have played out the hole,” Haas said. “But that happens. Phil made a huge mental error, and then they compounded it a little bit. But if he hadn’t been speeding, he wouldn’t have gotten a ticket. So I don’t have a problem with it.”